call super.connectedCallback after setting attributes to prevent infi…

…nite loop

Signed-off-by: Wouter Vroege <[email protected]>

src/reflected-properties-mixin.js

@@ -1,12 +1,12 @@
 export const ReflectedProperties = (SuperClass) => class extends SuperClass {
 
   connectedCallback() {
-    super.connectedCallback();
     for(var i in this.constructor.reflectedProperties) {
       const propName = this.constructor.reflectedProperties[i];
       const attrName = this.constructor.__getAttributeNameByPropertyName.call(this, propName);
       this.constructor.__setDOMAttribute.call(this, attrName, propName, this[propName]);
     }
+    super.connectedCallback();
   }
 
   propertyChangedCallback(propName, oldValue, newValue) {